title: A breathtaking headache.
mesh_terms: D000208:Acute Disease; D000293:Adolescent; D015444:Exercise; D006261:Headache / Q000209:etiology* / Q000628:therapy; D006801:Humans; D006985:Hyperventilation / Q000150:complications*; D008297:Male; D026741:Physical Therapy Modalities; D012064:Relaxation Therapy; D020301:Vasospasm, Intracranial / Q000150:complications / Q000209:etiology*